If Scott Walker wins Tuesday's recall election, he'll have 14 of America's richest people to thank.

Wisconsin's Governor has out-raised opponent Tom Barrett, the Mayor of Milwaukee, by almost 8 to one: $30.5 million to Barrett's $3.9 million. Of that huge haul, $1.68 million -- or, almost half Barrett's total -- came from 14 members of the Forbes billionaires list, all but one of whom live outside Wisconsin.

Walker's most generous donor does in fact reside in the state. Billionaire Diane Hendricks of roofing giant ABC Supply donated a total of $510,000 to Walker’s campaign — the biggest check for a governor’s race in Wisconsin history .

Hendricks' contribution came under scrutiny last month when a documentary filmmaker released a clip of Walker telling her he’d be employing a “divide and conquer” strategy against unions. Walker is, of course, fighting for his seat precisely because of his now infamous bill stripping public sector unions of collective bargaining rights.

In the video, Hendricks — the state's richest woman, worth $2.8 billion — asks if Walker can turn Wisconsin into a “completely red state”, and “work on these unions”. Walker responds: “Oh yeah,” then adds: “The first step is, we’re going to deal with collective bargaining for all public employee unions, use divide and conquer.”

Then there are the Koch brothers, Charles and David. The billionaire industrialists have not given directly to Walker's campaign, although their specter has hung over the Governor since an embarrassing incident last year.